My water bottle is 24oz and it has a tally bar on it which is pretty cool. I try for 4 bottle-96 oz which is more than the 64 and close to the 100 if I do half my body weight. Either way it works...as long as I am remembering to just keep drinking all day

I have a sports bottle and I take it with me everywhere...It is 24 oz and so if i keep it with me its a good way to track how much water I have had. I jsut got a vaspur bottle and its awesome because when its empty you can roll it up and put it in your purse without taking up a lot of space.

Albertsons, it was supposed to be like10.99 or 11.99 but it was 50% off so I snatched it up real quick. The tally bar thing is a piece you just twist around the lid. It counts up to 6. also the lid has a way to lock it so if the button is pushed it wont open :) I love it and it keeps the kids from spilling it.